Pentair FSH/FNS/Quad Nut (194997Z) premier or heater series shown in

or heater series shown in the product name

CMP generic Vac Lock cover

this deck flange helps support secure ladder installation and better long-term deck hardware performance

Silicone generic lens gasket from J & J Electronics for SpaBrite-style applications

and this Pleatco version uses the PIN3PAIR reference with C-3302 and FC-3751 cross references

Pentair FSH/FNS/Quad Nut (194997Z) premier or heater series shown inFor a clean repair, start with the correct part. Pentair FSH FNS Quad Nut (194997Z) addresses a specific service point while preserving compatibility with the intended Pentair application. This replacement nut is used in FSH, FNS, and Quad filter assemblies where proper hardware tension keeps internal parts secured. It is useful when the existing component shows wear, damage, age related failure, or performance issues in the larger pool or spa system.